本题目来源于试卷: Physics Unit11: Vibrations and Waves，类别为 国际高中通用物理
[单选题]
A mass vibrates back and fod j*-r8nj- elbrth from thepza26-x,ld9c,elz w v free end of an ideal spring of spring constant 20 N/m with an amplitude of 0.30 m. What is the kinetic energy of this vwz z2,ve-9xcl,6 adlpibrating mass when it is 0.30 m from its equilibrium position?
A. zero
B. 0.90 J
C. $0.45 \; J$
D. It is impossible to give an answer without knowing the object's mass.
参考答案: A
本题详细解析:
暂无
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